package collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

public class ListDemo {
    public static void main(String[] args) {
        List<String> list = new LinkedList<>();
        list.add("one");
        list.add("two");
        list.add("three");
        list.add("four");
        list.add("five");
        list.add("one");
        System.out.println("list:"+list);

        //E get(int index):获取指定下标的元素
        String e = list.get(2);
        System.out.println(e);
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }
        Iterator<String> it = list.iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
        for (String str : list){
            System.out.println(str);
        }
        //list.set(2,"six");//将下标为2的元素改为six
        String str = list.set(2,"six");//将下标为2的元素改为six,并将原数据返回给old
        System.out.println("list"+list);
        System.out.println(str);

        String s = list.remove(2);
        System.out.println("list"+list);
        System.out.println(s);

        //插入
        list.add(3,"seven");
        System.out.println("list"+list);
    }
}
